Abstract: An electrical connector is provided with electrical contacts comprising three contact zones or regions. The primary contact region is planar and parallel with the axis of insertion when two identical hermaphroditic connectors are mated. The tip of the contact assembly is formed to create a second contact zone and a third contact zone is formed at the same orientation as the second contact zone and disposed to be engaged by the second contact zone of the mating contact assembly. The housing of the connector is keyed to permit connection only with an identically keyed connector housing. The connector is provided with a strain relief formed integrally with the housing to resist the pulling of the conductors from the connector. The contact assembly engages the wire in the conductor when final assembly occurs, by means of a double insulation displacement contact.